You didn't try, did you? 
use strict;
use warnings 'all';

sub mfork ($$&) {
    my ($count, $max, $code) = @_;

    foreach my $c (1 .. $count) {
        wait unless $c <= $max;
        die "Fork failed: $!\n" unless defined (my $pid = fork);
        exit $code -> ($c) unless $pid;
    }

    1 until -1 == wait;
}


mfork 10, 3, sub {
    print "$$: " . localtime () . ": Starting\n";
    select undef, undef, undef, 2 + rand 2;
    print "$$: " . localtime () . ": Exiting\n";
};
__END__
972: Wed Oct  2 16:06:32 2002: Starting
973: Wed Oct  2 16:06:32 2002: Starting
974: Wed Oct  2 16:06:32 2002: Starting
973: Wed Oct  2 16:06:34 2002: Exiting
975: Wed Oct  2 16:06:34 2002: Starting
972: Wed Oct  2 16:06:35 2002: Exiting
976: Wed Oct  2 16:06:35 2002: Starting
974: Wed Oct  2 16:06:35 2002: Exiting
977: Wed Oct  2 16:06:35 2002: Starting
975: Wed Oct  2 16:06:38 2002: Exiting
978: Wed Oct  2 16:06:38 2002: Starting
977: Wed Oct  2 16:06:39 2002: Exiting
979: Wed Oct  2 16:06:39 2002: Starting
976: Wed Oct  2 16:06:39 2002: Exiting
980: Wed Oct  2 16:06:39 2002: Starting
978: Wed Oct  2 16:06:41 2002: Exiting
981: Wed Oct  2 16:06:41 2002: Starting
979: Wed Oct  2 16:06:41 2002: Exiting
980: Wed Oct  2 16:06:42 2002: Exiting
981: Wed Oct  2 16:06:45 2002: Exiting

[download]

Please consult the perlref manual page for syntax details dealing with references.

Abigail

In reply to Re: Limiting the number of forks by Abigail-II
in thread Limiting the number of forks by c

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